Traverse-machine.



J. F. BEiiSON. TRAVERSE MACHfNE. APPLICATION Fl LED JAN 3!, 1916- Patente Dec. 12,1916.

3 SHEETS-SHEET 1.

//1/ VIEW r09 Jffimsm a A TTOH/VE rs J. F. BENSON.

TRAVERSE MACHINE.

APPLICATION FILED JAN-31, 1916- 1,208,459. Patented Dec. 12, 1916.

3 SHEETS-SHEET 2.

W/T/VE ES W ATTORNEYS J. F. BENSON.

TRAVERSE MACHINE.

APPLlC/JION FILED JAN. 31, 19 16. 1,208,459.

Patented Dec. 12, 19%;.

3 SHEETS-SHEET 3.

WITNESSES a the latitude UNITED STATES JOHN F. BENSON,

or PORTSMOUTH,

VIRGINIA.

TRAVERSE-MACHINE.

Specification of Letters latent.

Patented Dec. 12, 1916.

Application filed January 31, 1916. Serial No. 75,342.

To all whom it may concern:

Be it known that I, J onn F. Benson, a citizen of the United States, and a resident of Portsmouth, in the county of Norfolk and State of Virginia, have invented a new and Improved Traverse-Machine, of which the following is a full, clear, and exact description.

My invention relates to a machine particularly adapted for mechanically performing certain computations necessary in the calculation of the area of land from field notes of the survey.

The object of the invention is to provide an automatic, simple and efiicient computing machine of the character stated with which and departure of any course may be obtained at one setting.

In its simplest form it consists of a protractor, distance indicator and registering wheels cotiperating with the distance indicator and adjustable in a predetermined relation on the distance indicator by the movement of the protractor.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is an isometric view of my machine in its simplest form, certain parts not forming part of the invention having been omitted to simplify the disclosure; Fig. 2 is plan of the machine; Fig. 3 is a front elevation; Fig. 4 is a horizontal section on line 4 4, Fig. 3; and Fig. 5 is a horizontal section on line 5 5, Fig. 3.

Referringto the drawings, 6 is the base of the machine, of any suitable material and convenient form. The protractor 7 is pivotally mounted on the base 6 to swing in a horizontal plane. Arvernier 8 is provided for the divisions of the protractor so that any angle between zero and 90 may be read to single minutes. The micrometer screw for facilitating an accurate setting is omitted for the sake of simplification. The

standard has a protractor 7 is provided with an arm 9 in the plane of the protractor. A stud 10-is formed on the arm adjacent the end of the arm. The stud 10 projects of a pair of crossing arms 11 and 12 forming part of slides 13 and 14 respectively. The two slots are at right angles to each other.

The slide 13 has an extension 15 engaging a socket 16 provided 'on the base which guides the slide in its movement when the same is displaced by the movement of the protractor. .The slide 14 has a similar extension 15 the socket 16 provided on the base for the purpose of guiding said displaced by the protractor. with a rigid upright lateral socket 18 engaged by aguiding rod 19. The outer end of each guide rod is secured to a corresponding lug 20 forming an integral part of the base, the inner ends 0 said.rods being secured to a bearing block 21 carried by a bearing frame 22 which is rigidly connected to the base 6. A distance indicator 23, in the shape of a disk, is mounted to revolve on the bearing block 21 in a horizontal plane. The center of rotation of said disk is in alinement with the intersection of the central lines of the slides 13 and 14;. The rotary motion of the disk 23 is imparted to registering wheels 2 and 25 mounted to revolve in vertical planes and having a frictional engagement with said disk. The two wheels are disposed at right angles to each other, each bearing in a corresponding frame 26 hinged to the corresponding standard 17, the weight carried by the frames helping to maintain the frictional engagement between the registering wheels and the disk. It will be noted that each of the recording wheels revolves in a vertical plane at right angles tothe direction of motion of the corresponding slide. The translatory motion imparted by the protractor to the registering wheels causes them to move along radial lines on the disk and at right angles to their planes of revolution, consequently, such motion will not cause them to revolve.

It will be seen that when the protractor is at zero (see Fig. 4) the cross arm 12 Wlll through the slots 1 aline with the slide'l3. As the protractor moves from zero to 90 the stud 10 will move in an are a b and when it is at 90 the, arm 11 will aline with the slide 14, the stud coinciding with the point 0.

, then =cos. d and %=sin. d.

wheel 24 will If R be the distance of the stud 10 from the 25 axis of rotation 0 of th he maximum distance through the locus of the point of contact between the said registering wheel and the disk will be a circumference havin a radius 'R. The length of the circum erence is then equal to 21rR. With the registering wheels at any the length of the circumfer- Wheel will be the register- 40 disk. For instance, the registering wheel 24, as shown in Fig. 2, travels on a circumference the length of which is equal to 21cR equals the length of th fzreiilce times cos. d.' If We divide the length 0 t hundred equal parts the disk can then be h any desired fractional part of a revolution, h any number of complete revolutions and apart of a revolug wheels are divided to measure off exactly the length of the circumpasses unhe registering Wheel distance from the center of the disk the registering Wheel will register one for a complete revolution of the Suppose it is desired to obtain the latitude 0 and departure of the c urse N 54 feet, the protractor 7 automatically 24 into such position that its-.distance from tie center of the disk equals R times cos.

54, and the measuring wheel 25 into such a g path traveled by the wheel 24'will position that its distance from the center of the disk equals R sin. 54?. s one revolution of the disk represents 100, the disk is turned 2.31 revolutions. The length of the maximum circumferential path passing a given point will be equal to 2 3.14l6 R 2.31, which equals '23l divisions on the disk 23. he length of any smaller circumferential path of radius 1', measured to the same scale, passing agiven point is 2 3.1416 r 2l31 and will be equal to X2-31. In the problem, the path of the wheel 24 Will have a radius of R cos. 54. Therefore the distance over the circumferential be equal to But the latitude of a course is equal to the of the bearing. Therefore the distance regwill be the latitude the distance 1 be the dehe distance indicator 23 is provided with a vernier 27 so that it can beset to .001 of its circumferential length. In addition, a revolution indicator 28 is ounted on the bearing frame 22 which is in mesh with a pinion mounted to revolve with the distance indicator 23 and whereby the number of revolutions made by the distance indicator is registered on the revolution indicator.

e revolution indicator is in the shape of a disk the margin of parts, each part representing one revolution of the distance indicator.

he registering wheels 24 and 25 have a diameter equal to one-half of the diameter of the disk 23. They are divided into 50 equal parts. A vernier 29 is provided for each of the registering Wheels reading to .1 of the smallest division. A Worm 30 is constrained to rotate with each of the registering wheels. worm Wheel 31 is driven by registered by the wheel 25 wil parture of the given course.

with A similar disk 34 is rotatably mounted in each of the frames 26. A gear 35 constrained to rotate With the disk 34 is in mesh with the corresponding pinion 33. The disks 32 are divided into twenty parts,

divided into ten parts. Worm Wheel to the worm is 20, While the ratio of the gear 35 to the pinion 33 is 10. To falicitate the reading on the disks 32 he ratio of the and 34 an indicating bracket 36 is secured to he mechanism for setting frame 26.

on disk, 23 70 i I protractor of revolutions of said disk,

protractor mounted to turn the machine to zero has been eliminated, as not forming part of the invention and to render the structure of the device plainer.

I claim:

1. In a machine of the class described a having an arm mounted to turn in a horizontal: plane,

at right angles to the slide, said arms crossing each other, a stud on the protractor arm engaging the slotted arms of the slides, a standard on each slide adapted toparticipate in the movement thereof, a disk mounted to revolve in the horizontal plane on an axis passing through the intersection of the Center lines of the slides, a frame on. each standard in pivotal engagement therewith, the force of gravity tending to move the frames toward the disk, a registering wheel in each frame mounted to revolve in the frame at right angles to the direction of motion of the corresponding slide, each of said wheels having a frictional engagement with the disk, means for registering the number of revolutions made by the disk, and means for registering the number of revolutions of each registering wheel carried by the corresponding frame of the wheel.

2. In a machine of the class described, a protractor having an arm mounted to turn in a horizontal plane, slides disposed at right angles to each other and each having a slotted arm at right angles to the corresponding slide, said arms crossing each other, a stud on the protractor arm engaging the slotted arms of the slides, the axis of movement of said protractor passing through the intersection of the center lines of the slides, a standard for each slide adapted to participate in the movement of the corresponding slide, a disk mounted to revolve in the horizontal plane on an axis coinciding with the axis of the protractor, an arm on each standard in pivotal engagement therewith so that the force of gravity tends to move the frames toward the disk, a registering wheel in each frame mounted to revolve in a plane at right angles to the direction of motion of the corresponding slide, each of said wheels having a frictional engagement with the disk, means for registering the number and means for registering the number of revolutions of each wheel.

3. In a machine of the class described a I in a horizontal plane, a distance indicator mounted to revolve in the horizontal plane, registering wheels mounted to revolve in vertical planes and engaging frictionally the distance indicator, gravitationally operable means carrying said registering wheels whereby the registering wheels are engaged frictionally with the distance indicator, and motion transmission means from the protractor to.

slides disposed at right angles and each having a slotted arm said gravitationally operable means whereby said registering wheels are displaced in a predetermined relation on said distance indicator. v

4. In a machine of the class described, a protractor mounted to turn in a horizontal plane, a distance-indicator mounted to revolve in the horizontal plane, registering wheels mounted to revolve in vertical planes and in frictional engagement with the distance indicator, motion transmission means from the protractor to the wheels for displacing said wheels on the distance indicator to and from the axis of rotation of said indicator, said motion transmission means including means whereby when one of said wheels is moved toward the axis of rotation, the other wheel is moved away therefrom.

5. In a machine of the class described, a protractor mounted to turn in a horizontal plane, a disk mounted to revolve in the horizontal plane and coaxial with the protractor, said disk having means for indicating distance, registering wheels mounted to revolve in a vertical plane and frictionally engaging the 'disk, a gravitationally operable frame for each of said registering wheels whereby the frictional engagement is maintained between the registering wheels and the disk, motion-transmission means from the protractor to the frames whereby the registering wheels are caused to move radially on the disk when the protractor is turned, said motion-transmission means including means whereby one of the wheels is caused to move toward the center of rotation of the disk, while the other is mox'ed away therefrom, means for indicating the number of revolutions of the disk, and means for indicating the number of revolutions of each of the registering wheels.

6. In a machine of the class described, a protractor mounted to turn. in a horizontal plane, a disk mounted to revolve in the horizontal plane and co-axial with the protractor, said disk having means for indicating distance, registering wheels mounted to revolve in vertical planes and frictionally engaging the disk, the diameter of the registering wheels bearing a predetermined ratio to the diameter of the disk, a gravitationally-operable frame for each of said registering wheels whereby the frictional engagement is maintained between the registering wheels and the disk, said registering wheels having divisions on the periphery thereof corresponding to the divisions of the disk, a vernier for said registering wheels carried by the corresponding frame, motiontransmission means from the protractor to the frames whereby the registering wheels are caused to move radially on the disk when the protractor is turned, said motion-transmission means including means whereby one of the wheels is caused to move toward the center of rotation of the disk while the other is moved away therefrom, means .for indicating the number of revolutions of the disk,

andmeans for indicating the number of revolutions of each of the registering wheels.

7. In a machine of the class described, a protractor mounted to turn 'in a'horizont'al plane, a disk mounted to revolve in the horizontal'plane spaced from the protractor and provided with divisions tance, registering wheels angles to each other and mounted to revolve in vertical planes-and in frictional engagement with said disk,

and motion transmisfor, indicating disdisposed at rightsion means from the protractor to the wheels for displacing said wheels radially on the disk, the motion-transmission means including means for displacing one of the wheels toward the axis of rotation of the disk while the otheris displaced away from the axis of rotation. v

In testimony.whereof 'I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN F. BENSON. Witnesses:

R. P. DENBY, JNo. M. BALDWIN. 

